1. STEREO IMPACT Preliminary Design Review 2001-September 11,12 David Curtis1 IMPACT Project Overview

2. STEREO IMPACT Preliminary Design Review 2001-September 11,12 David Curtis2 Organization IMPACT Suite managed by PI (Luhmann) and PM (Curtis) at UCB –SEP Team coordinated by von Rosenvinge at GSFC –Boom suite coordinated by Bob Lin at UCB Instrument Hardware developed at Co-Investigator Institutions (lead institution and Co-I listed): –MAG at GSFC (Acuna) –SWEA at CESR (Sauvaud) –STE at UCB (Larson) –Boom at UCB (Ullrich) –IDPU at UCB (Curtis) –HET at GSFC (Tycho) –LET at Caltech (Mewaldt) –SEPT at Kiel (Mueller-Mellin) –SIT at University of Maryland (Mason) –SEP Common Electronics at Caltech (Mewaldt)

3. STEREO IMPACT Preliminary Design Review 2001-September 11,12 David Curtis3 Contracting Project Contracts UCB –Phase A, Bridge contract complete –Phase B/C/D Contract in place UCB Subcontracts Caltech/JPL, University of Maryland, LBNL, UCLA –Phase A, Bridge contract complete –Phase B/C/D subcontracts in place (?) Modeler’s subcontracts on hold until closer to launch GSFC funded directly by Project –Funding in place Project contracts with LANL directly –Phase A, Bridge contract complete –Phase B/C/D contract in place (?) CESR funded by CNES (France) –Funding in place Kiel, Max Planck funded by DLR (Germany) –Funding in place ESTEC funded by ESA –Funding in place

4. STEREO IMPACT Preliminary Design Review 2001-September 11,12 David Curtis4 Development Plan Each subsystem will develop some level of ETU to prove the design concept The different ETUs shall be tested together to verify interfaces Most ETU testing will be complete by CDR ETUs shall be maintained through the life of the mission to provide a test bed for changes Flight unit assembly shall generally start following CDR –Long lead flight part procurement shall start following PDR Subassemblies shall be functionally tested and calibrated at the home institution –Some environmental tests will be performed at the subassembly level, such as Vibration and Thermal Vacuum, on a case by case basis. SEP subassemblies shall be integrated and tested at Caltech Boom subassemblies shall be integrated and tested at UCB The full suite will come together for EMC testing

5. STEREO IMPACT Preliminary Design Review 2001-September 11,12 David Curtis5 Schedule Complex multi-institutional interlocking development effort A top-level set of mile-stones marking the interactions between institutions has been developed Lower-level schedules maintained by each institution, linked to the top level milestone schedule Milestone schedule has been hierarchically divided into Top level and SEP –SEP deliveries to the rest of the team described on the top-level schedule –Deliveries internal to SEP described by the SEP milestone schedule –SEP Milestone schedule controlled by SEP team

6. STEREO IMPACT Preliminary Design Review 2001-September 11,12 David Curtis6 IMPACT Milestone Schedule

7. STEREO IMPACT Preliminary Design Review 2001-September 11,12 David Curtis7 SEP Milestone Schedule

8. STEREO IMPACT Preliminary Design Review 2001-September 11,12 David Curtis8 Schedule Analysis The suite flight hardware first all come together at the EMC test. The pacing item in scheduling the EMC test is currently the SEP delivery from Caltech (following SEP calibration and thermal vac) There are 7 weeks of slack in the SEP schedule prior to EMC A number of subsystems pace the SEP development with similar amounts of slack: –The VLSI (ASIC) used in HET, LET, and SIT –The LET board –The LET MISC board –The SSD bias supply –SEP Firmware There are 2 weeks of slack between EMC testing and delivery to the spacecraft There is some distributed slack in the development effort based on conservative scheduling estimates

9. STEREO IMPACT Preliminary Design Review 2001-September 11,12 David Curtis9 SYSTEM ENGINEERING

10. STEREO IMPACT Preliminary Design Review 2001-September 11,12 David Curtis10 IMPACT Instrument Locations on the Spacecraft Ahead Spacecraft Behind Spacecraft SWEA STE-D MAG STE-U IMPACT Boom SWEA STE-D MAG STE-U IMPACT Boom LET HET SIT SEPT-E SEPT-NS LET HET SIT SEPT-E SEPT-NS

11. STEREO IMPACT Preliminary Design Review 2001-September 11,12 David Curtis11 IMPACT Instrument Locations on the Spacecraft Ahead Spacecraft Behind Spacecraft SEPT-NS SEPT-E SIT HET LET STE-U

12. STEREO IMPACT Preliminary Design Review 2001-September 11,12 David Curtis12 Boom Suite (Stowed)

13. STEREO IMPACT Preliminary Design Review 2001-September 11,12 David Curtis13 Boom Suite (Deployed)

14. STEREO IMPACT Preliminary Design Review 2001-September 11,12 David Curtis14 SEP HET/LET/SIT/Common Electronics LET HET SIT

15. STEREO IMPACT Preliminary Design Review 2001-September 11,12 David Curtis15 SEP/SEPT

16. STEREO IMPACT Preliminary Design Review 2001-September 11,12 David Curtis16 IDPU

17. STEREO IMPACT Preliminary Design Review 2001-September 11,12 David Curtis17 Instrument Requirements Instrument Performance Requirements documented in IMPACTPerformanceSpec_E.doc Instrument Interface & Resource Requirements documented in IMPACT/Spacecraft ICD Environmental test requirements documented in 7381-9003 Contamination Control requirements documented in 7381-9040 EMC requirements documented in 7381-9030 Mission Assurance Requirements based on Project System Safety Mission Assurance document, and implemented in IMPACT PAIP Programatic requirements (deliverables, cost, schedule, etc.) covered in IMPACT contract

18. STEREO IMPACT Preliminary Design Review 2001-September 11,12 David Curtis18 MAG Performance Requirements MAG addresses mission level 1 requirements: 01.01.0002, CME Speed 01.01.0003, CME Direction 01.01.0008, Magnetic Field Measurement

19. STEREO IMPACT Preliminary Design Review 2001-September 11,12 David Curtis19 SWEA Performance Requirements SWEA addresses mission level 1 requirements: 01.01.0002, CME Speed 01.01.0006, Solar Wind Temperature 01.01.0007, Solar Wind Velocity 01.01.0008, Solar Wind Magnetic Field 01.01.0009, Solar Wind Density

20. STEREO IMPACT Preliminary Design Review 2001-September 11,12 David Curtis20 STE Performance Requirements STE addresses mission level 1 requirements: 01.01.0005, CME Initiation Location 01.01.0006, Solar Wind Temperature 01.01.0008, Solar Wind Magnetic Field 01.01.0011, Energetic Particle Distribution Function

21. STEREO IMPACT Preliminary Design Review 2001-September 11,12 David Curtis21 SIT Performance Requirements SEP (HET, LET, SEPT, and SIT) addresses mission level 1 requirements: 01.01.0003, CME Direction 01.01.0010, Location of Particle Acceleration 01.01.0011, Energetic Particle Distribution Function,

22. STEREO IMPACT Preliminary Design Review 2001-September 11,12 David Curtis22 SEPT Performance Requirements

23. STEREO IMPACT Preliminary Design Review 2001-September 11,12 David Curtis23 LET Performance Requirements

24. STEREO IMPACT Preliminary Design Review 2001-September 11,12 David Curtis24 HET Performance Requirements

25. STEREO IMPACT Preliminary Design Review 2001-September 11,12 David Curtis25 Intra-Instrument Interfaces Interfaces to IDPU documented by: –Serial Instrument Interface document covers the common hardware –IDPU Flight Software Requirements covers the software –Harness Specification covers harnesses between instruments –Documents controlled by UCB Interfaces between SEP instruments covered: –SEP ICD covers electrical interface –SEP Software Development Plan covers software requirements –Documents controlled by Caltech Interface to PLASTIC covered by: –Serial Instrument Interface document, controlled by UCB –PLASTIC Flight Software Requirements, controlled by UNH

26. STEREO IMPACT Preliminary Design Review 2001-September 11,12 David Curtis26 Resource Allocations

27. STEREO IMPACT Preliminary Design Review 2001-September 11,12 David Curtis27 IMPACT Block Diagram Color coded by circuit board in assemblies containing more than one board. STE-D SWEA MAG SIT HET LET SEPT-E SEP-Common SEPT-NS IDPU (Inside)

28. STEREO IMPACT Preliminary Design Review 2001-September 11,12 David Curtis28 IMPACT Harness Diagram

29. STEREO IMPACT Preliminary Design Review 2001-September 11,12 David Curtis29 IMPACT Grounding

30. STEREO IMPACT Preliminary Design Review 2001-September 11,12 David Curtis30 Configuration Control Preliminary IMPACT Configuration Control Plan submitted Problem reporting & Failure Review process described in IMPACT PAIP –Project to appoint a voting member of the IMPACT Failure Review Board IMPACT will comply with Project-level CM Plan on Project- controlled documents (Class 1 changes) –IMPACT PM takes the lead role in interfacing with Project CM Suite-level CM controlled by PM –Resources, Interfaces, Plans –Controlled documents maintained and controlled via a web site –PM controls changes at this level, as well as waiver/deviation process Subsystem-level CM controlled by instrument lead engineers –Schematics, As-built drawings, Travelers, Flight Software –Subsystems come under Suite-level CM when delivered to integration

31. STEREO IMPACT Preliminary Design Review 2001-September 11,12 David Curtis31 Performance Assurance IMPACT Performance Assurance Plan submitted to Project –Plan responds to the Project Mission Assurance Requirements Document –Plan covers all IMPACT Flight hardware/software and critical GSE development at all IMPACT institutions developing flight equipment –Mostly approved, pending an issue with Foreign CoI plan –Plan uses existing in-house procedures and practices (mostly based on NHB rather than ISO-9000)

32. STEREO IMPACT Preliminary Design Review 2001-September 11,12 David Curtis32 Contamination Control Plan IMPACT PAIP includes a section on Contamination Control adequate for IMPACT requirements –Primarily a set of procedures with a proven track record –PAIP Includes standard materials outgassing requirements Project Contamination Control Plan has additional requirements –Vacuum Bakeout –Surface Cleanliness –These requirements will be addressed mostly late in the I&T flow, with more relaxed requirements early, followed by cleaning and bakeout IMPACT has Contamination Issues at the Observatory Level –All instruments are purged and have non-flight covers to protect sensitive detectors (some have in-flight deployable covers) –There is a concern about humidity and strong solvents, mostly taken care of by the purge, but some solvents will be forbidden near the instruments

33. STEREO IMPACT Preliminary Design Review 2001-September 11,12 David Curtis33 Top 10 Risks Identified HIGH risk items have LOW probability of occurrence but HIGH Impact 13 Additional Moderate and Low-score risks identified, not listed here These risks are entered in the Project Risk Management Database IMPACT Management team have taken the GSFC Risk Management course

34. STEREO IMPACT Preliminary Design Review 2001-September 11,12 David Curtis34 Trade Studies